linux-kernel - [PATCH 3.12 167/235] x86/cpu: Fix bootup crashes by sanitizing the argument of the 'clearcpuid=' command-line option

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Message-Id: <c65fddff2fb7c68760ca5806389bda3b9dcbebe0.1485514374.git.jslaby@suse.cz>
Date:   Fri, 27 Jan 2017 11:55:00 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Lukasz Odzioba <lukasz.odzioba@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>, andi.kleen@...el.com,
        bp@...en8.de, dave.hansen@...ux.intel.com, luto@...nel.org,
        slaoub@...il.com, Ingo Molnar <mingo@...nel.org>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 167/235] x86/cpu: Fix bootup crashes by sanitizing the argument of the 'clearcpuid=' command-line option

From: Lukasz Odzioba <lukasz.odzioba@...el.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit dd853fd216d1485ed3045ff772079cc8689a9a4a upstream.

A negative number can be specified in the cmdline which will be used as
setup_clear_cpu_cap() argument. With that we can clear/set some bit in
memory predceeding boot_cpu_data/cpu_caps_cleared which may cause kernel
to misbehave. This patch adds lower bound check to setup_disablecpuid().

Boris Petkov reproduced a crash:

  [    1.234575] BUG: unable to handle kernel paging request at ffffffff858bd540
  [    1.236535] IP: memcpy_erms+0x6/0x10

Signed-off-by: Lukasz Odzioba <lukasz.odzioba@...el.com>
Acked-by: Borislav Petkov <bp@...e.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: andi.kleen@...el.com
Cc: bp@...en8.de
Cc: dave.hansen@...ux.intel.com
Cc: luto@...nel.org
Cc: slaoub@...il.com
Fixes: ac72e7888a61 ("x86: add generic clearcpuid=... option")
Link: http://lkml.kernel.org/r/1482933340-11857-1-git-send-email-lukasz.odzioba@intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/x86/kernel/cpu/common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 9364936b47c2..f415fd820c86 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1067,7 +1067,7 @@ static __init int setup_disablecpuid(char *arg)
 {
 	int bit;
 
-	if (get_option(&arg, &bit) && bit < NCAPINTS*32)
+	if (get_option(&arg, &bit) && bit >= 0 && bit < NCAPINTS * 32)
 		setup_clear_cpu_cap(bit);
 	else
 		return 0;
-- 
2.11.0